CN1036803A

CN1036803A - The Wimet that contains neodymium

Info

Publication number: CN1036803A
Application number: CN 89105708
Authority: CN
Inventors: 罗重麟; 游金秀; 姚学祥
Original assignee: ZHUZHOU CARBIDE ALLOYS FACTORY
Current assignee: ZHUZHOU CARBIDE ALLOYS FACTORY
Priority date: 1989-04-28
Filing date: 1989-04-28
Publication date: 1989-11-01

Abstract

The invention provides a kind of novel hard alloy, it is to be the hard phase with WC (can also add among TiC, TaC, NbC, ZrC, the HfC one or more), cobalt metal (or other iron family metal) is the bonding phase, and it is formulated to add the neodymium of 0.02～4% (weight) or the compound of neodymium (pressing neodymium metal calculates).The new alloy bending strength is significantly improved, and the inserted tool wear resistance and the shock resistance that make are all fabulous, and tool life improves 2～5 times than the inserted tool that does not add rare earth element, thereby reduces the cutter expense greatly.

Description

The Wimet that contains neodymium

The present invention relates to a kind of Wimet, it be with sosoloid such as WC or WC and WC-TiC be hard mutually, cobalt metal (or other iron family element ting) is mutually formulated for bonding.

Wimet is widely used as cutting tool with good wear resistance.But,, have the good wear resistance except requiring carbide cutter tool to big and complicated workpiece processing, more require it that good toughness is arranged, so that overcome the shock resistance deficiency of cutter in roughing or the interrupted cut process, thereby reduce cutter consumption, reduce the cutter expense.In the past, improve Wimet toughness and adopt content that improves cobalt in the Wimet or the method for adding TaC more, the shortcoming of this method is:

1, puies forward wear resistance and the cutter life that cobaltic content correspondingly can reduce Wimet;

2, the price of cobalt and tantalum carbide is more than the general tungsten carbide height, and the price of cobalt is 3～4 times of wolfram varbide, and the price of tantalum carbide is 10～15 times of wolfram varbide, therefore, still can not reduce the cutter expense significantly.

Early eighties, people begin one's study, and add rare earth metal in Wimet, to improve the toughness of alloy.Clear 59-41440 " adds the Wimet of Gadolinium " as day disclosure special permission communique; Day disclosure is speciallyyed permit clear 59-41442 and " is added the Wimet of praseodymium ", can both improve the hot strength and the wear resistance of alloy significantly.Yet the price of Gadolinium and praseodymium is also relatively more expensive, the more important thing is that its effect is also not ideal, still fails to solve satisfactorily the high and low problem of Wimet toughness of cutter expense.

Purpose of the present invention is exactly in order to overcome the weak point in the above-mentioned raising Wimet toughness method, adopt and in Wimet, add rear earth element nd, reach under the condition that does not reduce the Wimet wear resistance, improve its bending strength and toughness, thereby improve the shock resistance of inserted tool, satisfy and process big and the technical requirements of complex part, the while is reduced the cutter expense greatly.

Characteristics of the present invention are:

1, contain 0.02～4%(weight in the Wimet) neodymium (press neodymium metal calculate);

2, rear earth element nd can metal or the form of compound add.When adding compound, its amount also should be calculated by rare earth metal.

Concrete implementation step of the present invention is: with the WC powder that weighs up (can also add again among TiC, TaC, NbC, ZrC, the HfC one or more), the compound (also can add other rare earth element) of metal cobalt powder (or other iron family element ting), rare earth metal neodymium or neodymium and grinding medium ground and mixed in ball grinding cylinder, discharging adds forming agent with dry back, coldmoulding, at last with pressed compact at 1400～1500 ℃ of sintering temperatures, just of the present inventionly contain the neodymium Wimet, or contain the Wimet of other rare earth element.

Embodiments of the invention are as follows:

Embodiment 1, is 85.97%WC-5.01% TiC-9.02%C with aforesaid method preparation composition _oAlloy sample and composition be 85.82%WC-5%TiC-9%C _oSeven kinds of alloys of-0.18% rare earth metal, above-mentioned rare earth metal are respectively the content of La, Ce, Pr, Nd, Gd, Y, mishmetal M(cerium greater than 45%) in a kind of.The alloy sample numbering is followed successively by X, L, C, P, N, G, Y and M.Survey room temperature hardness, room temperature strength, hot hardness and the hot strength (as shown in table 1) of alloy sample then.In eight kinds of alloy samples, best with the over-all properties of adding rare earth metal Nd.

The performance comparison of table 1, eight kinds of Wimet (three mean value)

Embodiment 2, to produce composition with aforesaid method be 87.86%WC-3%TiC-3%T _aC-6.02%Co-0.12%Nd ₂O ₃Sample A and do not add Nd ₂O ₃Sample B, survey its room temperature hardness, bending strength (as shown in table 2) then.Be added with Nd ₂O ₃The bending strength of sample improve 16%.

Table 2

Embodiment 3, be 85.91%WC-5%TiC-9%C with aforesaid method preparation composition _OThe sample C of-0.09%Nd and the sample D that does not add Nd survey its performance then and make cutting test, the results are shown in table 3 and table 4.

Found out that by table 3 and table 4 bending strength of adding the Wimet of Nd improves 24.9%, hot strength improves 8%, and during machining, shock resistance is fabulous, and durability is not for adding more than three times of Nd Wimet.

Embodiment 4, are 91.94%WC-8%C with aforesaid method preparation composition _oThe sample E of-0.06%Nd and the sample F that does not add Nd, alloy sample carry out the interrupted cut test, and it the results are shown in table 5.

Table 5

Embodiment 5, are 85%WC-5%TiC-9%C with aforesaid method preparation composition _oThe sample C of-1%Nd and the sample H that does not add Nd carry out the interrupted cut test, result such as table 6 then.

Table 6

Can find out by above embodiment:

1, neodymium is additive best to Cemented Carbide Properties impact in the rare earth element, and effect goes with Gadolinium than praseodymium, and its price only has 1/2～1/3 of praseodymium or Gadolinium, and the cost of charp tool is only than the increase by 0.8% that does not add rare earth metal.

2, in carbide alloy, add rare earth metal neodymium, can greatly improve bending strength and the toughness of carbide alloy. Its bending strength can improve more than 10～20%, the hard alloy cutter wearability and the shock resistance that make are all fabulous, can greatly reduce the tipping phenomenon in roughing and interrupted cut process, tool life can improve 200～500% than the hard alloy cutter that does not add neodymium.

3, the carbide alloy of interpolation rare earth metal neodymium is a kind of novel hard alloy that can greatly increase economic efficiency.

Claims

1, a kind of Wimet, it is to be the hard phase with WC (can also add again among TiC, TaC, NbC, ZrC, the HfC one or more), with cobalt metal (or other iron family metal) is the bonding phase, formulated, it is characterized in that also containing the neodymium (pressing neodymium metal calculates) of 0.02～4% (weight).

2, Wimet according to claim 1, it is characterized in that neodymium can neodymium metal or the form of the compound of neodymium add, its addition all calculates by neodymium metal.